Tryck

a) $F=p\mathrm{\pi }{r}^{\mathit{2}} , r\mathit{=}\sqrt{\frac{F}{p\pi }}\approx 2,5\mathit{ }cm$'

b) $R=0,025 m$,  $F=p\mathrm{\pi }({\mathrm{R}}^2-r^{\mathit{2}}) =0,8·{10}^6·\mathrm{\pi }(0,{025}^2-0,{01}^2)\approx 1354 \mathrm{N}\approx 1,4 \mathrm{kN}$

Stämmer det?